Abstract
Polyphenylacetylene, in good yields and with high molecular weight, has been obtained using three new Rh based catalytic systems, i.e. [Rh(COD)(SC 6F 5)] 2, [Rh(COD)(SC 6H 5)] 2 and Rh(SC 6F 5)(Pφ 3)(COD) where COD = 1,5-cyclooctadiene. 1H- and 13C-NMR spectra have shown that the polyphenylacetylene obtained is highly stereoregular. The dependence of polyphenylacetylene yield and molecular weight on different experimental factors, namely solvent characteristics and monomer initial concentration, is also discussed in this work. Although the mechanism by which these catalysts polymerize phenylacetylene has not been completely elucidated due to its high complexity, new information was obtained and a catalytic mechanism has been proposed.
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